Re: [sca-c-cpp] NEW ISSUE: Concurrency Model for each scope

[Andrew Borley <BORLEY@uk.ibm.com>]

This issue has been assigned id CCPP-53
in the Jira system

See http://www.osoa.org/jira/browse/CCPP-53

Andrew

____________________________________________________________

Andrew Borley
Websphere ESB Development
Tel: 245393 Ext: +44 (0) 1962 815393 Mob: +44 (0) 7971 805547
E-mail: borley@uk.ibm.com
Mailpoint 211, IBM (UK) Ltd, Hursley Park, Winchester, Hants, SO21 2JN
____________________________________________________________

From:	Bryan Aupperle <aupperle@us.ibm.com>
To:	sca-c-cpp@lists.oasis-open.org
Date:	01/12/2008 19:37
Subject:	[sca-c-cpp] NEW ISSUE: Concurrency Model for each scope

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Target:                SCA C++
and C C&I Specifications:  sca-cppcni-1.1-spec-cd01-rev3.doc and
sca-ccni-1.1-spec-cd01-rev3.doc (section 2.3 of each spec).

Description: 
From (http://www.osoa.org/jira/browse/JAVA-61):
The spec needs language to describe
the concurrency model that a component developer needs to be prepared for
when using any of the scopes. For example, the spec never describes whether
or not a composite scoped implementation needs to be able to support concurrent
execution on the same runtime instance. 

The Java TC at a Nov. F2F adopted the following: 

1) Stateless Scope 
Single threaded - the SCA runtime MUST ensure that an implementation instance
object is only ever dispatched on ONE thread at any one time. In addition,
within the SCA lifecycle of an instance, the SCA runtime MUST only make
a single invocation of one business method.  (NB the SCA lifecycle
might not correspond to the Java object lifecycle due to runtime techniques
such as pooling) 
2) Composite Scope 
Multi-threaded - the SCA runtime MAY run multiple threads in a single implementation
instance object and it MUST NOT perform any synchronization
3) Conversation scope 
Multi-threaded - the SCA runtime MAY run multiple threads in a single implementation
instance object and it MUST NOT perform any synchronization

Proposal: 

Awaiting final wording from Java 

Bryan Aupperle, Ph.D.
STSM, WebSphere Enterprise Platform Software Solution Architect

Research Triangle Park,  NC 
+1 919-254-7508 (T/L 444-7508)
Internet Address: aupperle@us.ibm.com

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